PT0E-1860

MODEL RX-8700 CONDENSED USER GUIDE
Inspections before use
1. Check that the battery level is sufficient.
2. Check that there are no bends or holes in the gas sampling hose and filter tube.
3. Check that the filter in the gas sampling probe and filter
tube are free of dust or clogging.
(3)
4. Check the gas monitor + (1) Relay tube + (2) Filter tube + (3)Gas sampling hose + (4) Gas sampling probe in order to make(4)
sure they are connected properly.

Usage

(2)
(1)

[Names of each part]

1. Turning the power on
Hold down the POWER/ENTER button (three secondsor more) until the buzzer beeps to turn the power on.
When "Filter Probe" is displayed, check that the filter
tube is connected and press the ENTER button. Thebuzzer beeps twice and then the measurement
screen is displayed.
RX-8700 is started in H2S [high concentration]measuring mode.

Buzzer soundopening

LCD display

Alarmwindow

Infrared port
Alarmwindow

Alarm window

PEAK/L/H
ESC button△/AIR button
PUMP/▽ button

POWER/ENTERbutton

2. Performing air calibration
When performing air calibration in atmosphere, check the atmosphere for freshness before starting.

[Air calibration procedure screen]
(1)

(2)

⇒Press and hold the AIR
button on the measurement
screen.

Release your finger from theAIR button when the screen
above is displayed.

(3)⇒The screen above isdisplayed when air
calibration is completed.

3. Switching the hydrogen sulfide measuring mode range
Use this to switch between H2S [high concentration] measuring mode and HC/O2/H2S[low concentration] measuring mode.
Hold down the L/H button (about one second) andrelease your finger when the buzzer beeps once.
To switch the measuring mode, check that thehydrogen sulfide concentration is less than 100
ppm in the H2S [high concentration] measuringmode first. Higher concentrations may cause
HC/O2/H2S [low concentration]
H2S [high concentration]
damage to the sensor.
measuring modemeasuring mode

4. Performing measurements

Measure the gas concentration from the measurement screen. Put the gas sampling probe close to themeasurement area.
Once gas concentration measurement starts, the gas monitor draws in measuring gas for a certain
period of time and then displays a concentration value as the measurement result.

5. Turning the power off
Press and hold the POWER/ENTER button until the buzzer beeps three times and the LCD display
turns off.

Note: Refer to the operating manual for more details.

MODEL RX-8700 CONDENSED USER GUIDE
Usage
6. Replacing/charging the battery[Li-ion battery unit]
Insert the AC adapter plug into the charging jackon the side of the battery unit to charge thebattery.

[Dry battery unit]
Use a flathead screwdriver or similar tool to openthe battery cover on the bottom of the main unit,
and replace the three dry batteries with new ones.
Dry batteries

DangerReplace the dry battery unit and drybatteries, or charge the Li-ion battery unit
in a safe place.

Charging
jack

Plug

AC adapter

Troubleshooting
Symptoms
The power cannot be
turned on.

Abnormal operations.
Cannot operate the gasmonitor.
System abnormalities[FAIL SYSTEM]

CausesActions

The battery level is too low.

(1) Dry battery unit: Replace all the three dry batteries withnew ones in a safe place.
(2) Li-ion battery unit: Charge the battery unit in a safe place.

Improper installation of thebattery unit.
Disturbances by sudden surge
noise, etc.
Disturbances by sudden surge
noise, etc.
A main unit circuit abnormality
occurred.

Sensor abnormalities[FAIL SENSOR]

A sensor has failed.

A low battery voltage
alarm is displayed.
[FAIL BATTERY]

The battery level is low.

A low flow rate alarm isdisplayed.
[FAIL LOW FLOW]

Water, oil or the like has beendrawn in.
The gas sampling hose isclogged.
The pump has deteriorated.

Air calibration impossible[FAIL AIR CAL]

Fresh air is not supplied aroundthe gas monitor.
Drifting of sensor output.
Presence of interference gas.

The reading rises (drops)
and remains.

Slow leak.
Environmental changes.

Check whether the battery unit is properly attached to themain unit.
Turn off the power once and then turn it on again (restart).
Remove the battery unit in a safe place. Then reinstall it andturn on the power to perform operations.
Contact your sales outlet or closest RIKEN KEIKI dealer torequest repairs.
Contact your sales outlet or closest RIKEN KEIKI dealer toreplace the sensor. (If [FAIL] is displayed at power-on, thealarm can be reset by pressing the ESC button. The unit cancontinue being used for other gases using sensors otherthan the failed one.)(1) Dry battery unit: Turn off the power and replace the drybatteries with new ones in a safe place.
(2) Li-ion battery unit: Turn off the power and charge it in asafe place.
Check the gas sampling hose for any damage or traces ofdrawn water, oil, etc.
Check the gas sampling hose connections, clogging,twisting, etc.
Contact your sales outlet or closest RIKEN KEIKI dealer toreplace the pump.
Draw fresh air properly and perform air calibration again.
Perform the air calibration.
Check if any interference gas such as solvent is present, andtake measures properly.
A very small amount of the gas to be measured may beleaking (slow leak). Ignoring this may result in a dangerous
situation, so take the same actions and measures as thosewhen a gas alarm occurs.
Perform the air calibration. In particular, the oxygen sensor isaffected by the air pressure.

This troubleshooting chart is to be used as a simple guide for identifying the causes of common malfunctions.
Contact your sales outlet or closest RIKEN KEIKI dealer if your gas monitor is experiencing symptoms not listed
here, or if symptoms remain unresolved even after taking these actions.

Make sure to inspect your gas monitor once a year or more frequently,
to ensure that performance is maintained.

Note: Refer to the operating manual for more details.